What does Riet mean?

"Does anyone have a riet for this bottle?" he asked at the table.

Dutch student slang. This is a Dutch word. You will hear it a lot at Dutch universities, student associations and in student houses.

Riet means reed, the plant straws used to be made of. Students use one to do a rietadt or rietbak. That way a drink is gone even faster than the normal way.